Anyone have a complete weld-up header kit for a 454 that they never used, and want to sell?

If not, anyone know where I can get a set reasonably priced? I'm seeing prices of these kits around $250-$400. I can get a set of headers for that same price, what would be the point of getting weld-up if I can just buy the completed set with no weld seams for the same price?